My husband had a meningioma removed april 4thlast year. He is suffering from very bad headaches still. Only on the side of the surgery and only when he is upright. Didn't have headaches before op.?

Should see doctor! If the headaches began after the surgery, he should see the neurosurgeon first to make sure there is nothing (like a blood clot) related to the surgery. If not, his neurologist or primary care physician should check him out for other causes of headaches.
Bothersome. Without knowing the size or behavior of the meningioma this is tough to answer.If it was growing or causing symptoms surgery was required.Headache beats seizures every time.